Thermodynamic and magnetic properties of the layered triangular magnet NaNiO2

Details Thermodynamic and magnetic properties of the layered triangular magnet NaNiO2 Thermodynamic and magnetic properties of the layered triangular magnet NaNiO2

2005-06-06

arxiv.org/abs/cond-mat/0506141v1

Physical Review B 72, 104414 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.72.104414

We report muon-spin rotation, heat capacity, magnetization, and ac magnetic susceptibility measurements of the layered spin-1/2 antiferromagnet NaNiO2. These show the onset of long-range magnetic order below T_N = 19.5K. Rapid muon depolarization persisting to about 5K above T_N is consistent with the presence of short-range magnetic order. The temperature and frequency dependence of the ac susceptibility suggests that magnetic clusters persist above 25K in the paramagnetic state and that their volume fraction decreases with increasing temperature. A frequency dependent peak in the ac magnetic susceptibility at T_sf = 3K is observed, consistent with a slowing of spin fluctuations at this temperature. A partial magnetic phase diagram is deduced.

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